I have changed my master cylinder.I have blew out my brake lines and still have no brake fluid through my lines nor out of my cylinder when lines are disconnected from cylinder.I even diconnected line from rear distribution block and have no flow of fluid coming out .please tell me what's wrong

Did you bench bleed the master cylinder, prior to installation?

I had it professionally installed not to say they did it though.how do you bench bleed a cylinder?any ideas what else it can be ?any suggestions would be a blessing

After verifying that the master cylinder was properly bench bled, I would fill the master cylinder with brake fluid (e.g. Valvoline) and bleed the system in this order: RR, LF, LR, and RF. If you have trouble, try using a pressure bleeder.

After verifying that the master cylinder was properly bench bled, I would fill the master cylinder with brake fluid (e.g., Valvoline) and bleed the system in this order: RR, LF, LR, and RF. If you have trouble, try using a pressure bleeder.

Thank you I will try that

A pressure bleeder will make short work of this job. If you can't run one down, use a one-man bleeder--I use one made by Cal-Van. It has a one-way check valve in it, so air can't get into the system.